convert_shader_mv_uv.py

#========================================
#    author: Changlong.Zang
#      mail: zclongpop123@163.com
#      time: Wed Feb 16 13:41:00 2022
#========================================
import re
import os
import shutil
import itertools
import maya.cmds as mc
import pymel.core as pm
import maya.OpenMaya as OpenMaya
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attr_map = {
    'baseColor': 'color',
    'opacity':'transparency',
    'metalness':'incandescence',
    'specularRoughness':'sc',
    'normalCamera':'normalCamera'
}

udim_list = [list(range(1001, 1101)[i:i+10]) for i in range(0, 100, 10)]

def main(geometry):
    '''
    '''
    #- 
    mesh_pml_node = pm.PyNode(geometry)
    mesh_api_obj  = mesh_pml_node.__apimobject__()
    mesh_api_mfn  = OpenMaya.MFnMesh(mesh_api_obj)

    u_array = OpenMaya.MFloatArray()
    v_array = OpenMaya.MFloatArray()

    mesh_api_mfn.getUVs(u_array, v_array)

    u_array = [x // 1 for x in u_array]
    v_array = [x // 1 for x in v_array]

    uv_units = list()
    for u, v in zip(u_array, v_array):
        k = 'uv_{0}'.format(udim_list[int(u)][int(v)])
        if k not in uv_units:
            uv_units.append(k)

    #-
    sg_nodes = list()
    sg_iterator = OpenMaya.MItDependencyGraph(mesh_api_obj, OpenMaya.MFn.kShadingEngine, OpenMaya.MItDependencyGraph.kDownstream)
    while not sg_iterator.isDone():
        sg_nodes.append(OpenMaya.MFnDependencyNode(sg_iterator.currentItem()).name())
        sg_iterator.next()
    sg_nodes = [sg for sg in sg_nodes if sg not in ['initialShadingGroup']]


    #- 
    shading_data = dict()
    for sg_node, unit in itertools.product(sg_nodes, uv_units):
        shading_node = pm.PyNode(sg_node).surfaceShader.connections()
        if not shading_node:
            continue

        if not pm.nodeType(shading_node[0]).startswith('ai'):
            continue

        #-
        members = list()
        for meb in pm.sets(sg_node, q=True):
            if not '.f' in meb.name():
                members.extend(mc.ls('{0}.f[:]'.format(meb.name()), fl=True))
            else:
                members.extend(mc.ls(meb.name(), fl=True))

        shading_data[shading_node[0].name()] = members

        #-
        shader_name  = '{0}_{1}'.format(unit, shading_node[0].name())
        if mc.objExists(shader_name):
            continue

        blinn_shader = pm.shadingNode('blinn', name=shader_name, asShader=True)
        blinn_sg     = pm.createNode('shadingEngine', name='{0}SG'.format(blinn_shader))
        blinn_shader.outColor >> blinn_sg.surfaceShader

        for ai_attr in attr_map.keys():
            color_plug = shading_node[0].attr(ai_attr).__apiobject__()
            iterator = OpenMaya.MItDependencyGraph(color_plug, OpenMaya.MFn.kFileTexture, OpenMaya.MItDependencyGraph.kUpstream)
            texture_node = None
            while not iterator.isDone():
                texture_node = pm.PyNode(OpenMaya.MFnDependencyNode(iterator.currentItem()).name())
                iterator.next()

            if texture_node is not None:
                new_texure_node = pm.duplicate(texture_node)
                new_texure_node[0].setName('{0}_{1}'.format(unit, texture_node))
                orig_img = new_texure_node[0].ftn.get().replace('\\', '/').replace('.tx', '.tif')
                new_img  = orig_img.replace('/tex/', '/uetex/')

                img_udim = re.search('(?<=_)\d{4}(?=\.)', new_img)
                if img_udim:
                    new_img = re.sub(img_udim, 'ue{0}'.format(img_udim.group()), new_img)

                if os.path.isfile(orig_img) and not os.path.isfile(new_img):
                    if not os.path.isdir(os.path.dirname(new_img)):
                        os.makedirs(os.path.dirname(new_img))
                    shutil.copy2(orig_img, new_img)

                new_texure_node[0].ftn.set(new_img, typ='string')
                new_texure_node[0].uvTilingMode.set(0)
                new_texure_node[0].outColor >> blinn_shader.attr(attr_map[ai_attr])


    pm.delete(sg_nodes)
    for shader, faces in shading_data.items():
        for f in faces:
            fn = pm.PyNode(f)
            us, vs = fn.getUVs()
            uc = sum(us) / len(us)
            vc = sum(vs) / len(vs)
            unit = 'uv_{0}'.format(udim_list[int(uc // 1.0)][int(vc // 1.0)])

            unit_shader = '{0}_{1}'.format(unit, shader)
            if not unit_shader:
                continue
            mc.sets(f, e=True, forceElement='{0}SG'.format(unit_shader))



if __name__ == '__main__':
    for geo in mc.ls(geometry=True):
        main(geo)